1 files changed, 85 insertions, 0 deletions
diff --git a/crypto/src/asn1/DerSequence.cs b/crypto/src/asn1/DerSequence.cs
new file mode 100644
index 000000000..b50a77962
--- /dev/null
+++ b/crypto/src/asn1/DerSequence.cs
@@ -0,0 +1,85 @@
+using System.Collections;
+using System.IO;
+
+namespace Org.BouncyCastle.Asn1
+{
+ public class DerSequence
+ : Asn1Sequence
+ {
+ public static readonly DerSequence Empty = new DerSequence();
+
+ public static DerSequence FromVector(
+ Asn1EncodableVector v)
+ {
+ return v.Count < 1 ? Empty : new DerSequence(v);
+ }
+
+ /**
+ * create an empty sequence
+ */
+ public DerSequence()
+ : base(0)
+ {
+ }
+
+ /**
+ * create a sequence containing one object
+ */
+ public DerSequence(
+ Asn1Encodable obj)
+ : base(1)
+ {
+ AddObject(obj);
+ }
+
+ public DerSequence(
+ params Asn1Encodable[] v)
+ : base(v.Length)
+ {
+ foreach (Asn1Encodable ae in v)
+ {
+ AddObject(ae);
+ }
+ }
+
+ /**
+ * create a sequence containing a vector of objects.
+ */
+ public DerSequence(
+ Asn1EncodableVector v)
+ : base(v.Count)
+ {
+ foreach (Asn1Encodable ae in v)
+ {
+ AddObject(ae);
+ }
+ }
+
+ /*
+ * A note on the implementation:
+ * <p>
+ * As Der requires the constructed, definite-length model to
+ * be used for structured types, this varies slightly from the
+ * ASN.1 descriptions given. Rather than just outputing Sequence,
+ * we also have to specify Constructed, and the objects length.
+ */
+ internal override void Encode(
+ DerOutputStream derOut)
+ {
+ // TODO Intermediate buffer could be avoided if we could calculate expected length
+ MemoryStream bOut = new MemoryStream();
+ DerOutputStream dOut = new DerOutputStream(bOut);
+
+ foreach (Asn1Encodable obj in this)
+ {
+ dOut.WriteObject(obj);
+ }
+
+ dOut.Close();
+
+ byte[] bytes = bOut.ToArray();
+
+ derOut.WriteEncoded(Asn1Tags.Sequence | Asn1Tags.Constructed, bytes);
+ }
+ }
+}
|
